Former heavyweight champion and boxing legend Mike Tyson stopped by the Men’s Fitness offices to discuss his new HBO film, Mike Tyson: Undisputed Truth, and his recently released autobiography of the same name. In the spirit of both projects, Tyson spoke openly about his life and reflected on some of the most important lessons he’s learned along the way.

The film, an edited taping of Tyson’s hit one-man Broadway show directed by Spike Lee, is an emotional rollercoaster, and Tyson holds nothing back. A lot of ground is covered in 90 minutes: From his proudest moments—becoming the youngest world heavyweight champion ever, learning to be a family man—to his darkest lows—addiction, prison, Evander Holyfield’s ear—Tyson tells his story in his own words and in a way that feels genuine throughout.

In this exclusive interview with Men’s Fitness, Tyson talks about the grueling reality of what it takes to be a world champion. As a man who once had a bank balance of $400 million and was at one point unknowingly paying Don King $8,000 a week for “towels,” Tyson is able to provide a raw, unfiltered—sometimes hilarious—insight into the life of one of the most intriguing athletes of our time.

Stay tuned for Part 2 of Tyson’s exclusive interview with Men’s Fitness. And catch the premiere of Mike Tyson: Undisputed Truth on HBO, Saturday November 16. His nearly 600-page memoir, also titled Mike Tyson: Undisputed Truth, is on sale now.